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[Xen-devel] [PATCH v3 2/4] Nested VMX: Force check ISR when L2 is running

From: Yang Zhang <yang.z.zhang@xxxxxxxxx>

External interrupt is allowed to notify CPU only when it has higher
priority than current in servicing interrupt. With APIC-v, the priority
comparing is done by hardware and hardware will inject the interrupt to
VCPU when it recognizes an interrupt. Currently, there is no virtual
APIC-v feature available for L1 to use, so when L2 is running, we still need
to compare interrupt priority with ISR in hypervisor instead via hardware.

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
 xen/arch/x86/hvm/vlapic.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index 7a154f9..f1530fd 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -37,6 +37,7 @@
 #include <asm/hvm/io.h>
 #include <asm/hvm/support.h>
 #include <asm/hvm/vmx/vmx.h>
+#include <asm/hvm/nestedhvm.h>
 #include <public/hvm/ioreq.h>
 #include <public/hvm/params.h>
@@ -1037,7 +1038,8 @@ int vlapic_has_pending_irq(struct vcpu *v)
     if ( irr == -1 )
         return -1;
-    if ( vlapic_virtual_intr_delivery_enabled() )
+    if ( vlapic_virtual_intr_delivery_enabled() &&
+         !nestedhvm_vcpu_in_guestmode(v) )
         return irr;
     isr = vlapic_find_highest_isr(vlapic);

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